I'm on the iPad 1 and was going to upgrade to the iPad 4. That was, until they announced the mini alongside it. The mini is better than the 4 in every way for what I use my iPad for. So, I'm basically passing on the iPad 3/4 to get the mini.
Call me crazy but I have been using my mini more than my ipad 3 so I decided to get rid of the ipad 3. Screen resolution doesn't bother me and its just easier for me to hold and do what I want to do. I actually like reading books on the mini more than the bigger ipad. I have to say I just love the mini.